Link Building 20 high pr do follow - no follow
Backlinks are somewhat of a popularity contest. If people like your site and they like your content, they want to share your information with the world.
This is done through backlinking and major search engines use the amount of backlinks your site has as a way to gauge how popular your site - outside of website traffic. Backlinks can increase your ranking on search engines and get new people to find your site.